Check-valve.



J. CALLICOTTlv CHECK VALVE.'` APPLICATION FILED NOV- 26. 19H.

Patented Sept. 211918.

miran sra'rns rarnnr oraison.

JOHN cALLIcOTn'oF TORONTO, onTAaIo,cA1vADA.

oniron-venire.f`

of Canada, have invented certainnew and usefulV Improvements in Check-Valves, and` do hereby declare that thefollowing is a full, clear, and eXact description of same.

This invention relates to valves of the type generally known as check valveshav ing for its object to provide a device adaptable to all the general purposes of a `check valve and also capable of operating under respectively varying closing and releasing pressures, that is to say, the valve maybe closed by the action of a predetermined fluid pressure and may remain so closed notwithstanding a reduction in such pressure, the opening of the valve takin placewhen the pressure has dropped to a c esired extent.

A furtherv Objectis to yprovide interchangeable parts of the valve whereby the operation of the said valve may be varied to suit requirements by the addition to, removal, or substitution of such interchangeable parts where necessary or desirable.

Further objects subsidiary to or resulting from the aforesaid mainobjects orV from the construction of the invention as it'may be carried into effect will become apparent as the nature of the inventionzis hereinafter further disclosed.

In carrying the said invention into effect I may ,provide 'a novel constructionfand ar rangement of parts whereby 4a ball check valve is inclosed by a ball casing having an outlet orifice at one end thereof andan inlet orifice at the opposite end thereof, which said inlet orifice accommodates a seat .for the said ball in the form of a tube' inserted into the sa1d ball casing and suitably ground to receive n the ball, the cavityrin the casing being of such configuration that the ball may close the outlet orifice in one position and snugly seat itself in the vcorrespondinglyshaped wallof the said cavity, and when in its Open or inactiveposition will permit freev passage of air around the said ball and through said outlet orifice from the said. vtubular valve seat, which is provided with radial recesses or passages to permit such fluid circulation. The tubular valve seat is intended to accommodate the spindle of a plungerslidably contained withi na valve casing connected to the said ball casing, said .plunger normally resting upon a suitable seat in the said casing and v Specification of Letters Patent. i Patented Sept. 24, 1918." Application filed November 26", 1917. Serial N o. 204,050.

' surmountinig al slidable Weight oriffloa-t, as

casing, which, is provided with an inlet orilice beneath the said weight or float by which l fluid is admitted to the valve, all of which is more particularly described and ascertained hereinafter, having reference to the accompanyingl drawings,in which Figure 1` is a sectional elevation of a valve constructed in accordance with this my invention: Y i

Fig. 2 is a similar viewof Fig. l illustrating the parts in different position; v

Fig. 3 is a broken perspective view of the spindle, and Y Fig. l is a broken perspective view of the upper end of the tubular ball valve seat.

Similar characters of reference indicate similar parts in the several figures of the drawings, and Figs. 3 and 4 are drawn to a somewhat larger scale than Figs. l and 2.

a; is the valve. casinghaving at one end an inlet orifice a and at the other end a cap Z) carryinga tubularE ball valve seat c, the said cap being surmounted by a ball casing d which has an outlet orifice el 4in the upperl end thereof and engages with the said tubular valve seat c, e being the ball which is accommodated in the said ball casing cl and normally rests upon the upper end of the tubular valve seat c, which is preferably beveled as at c to pro erly receive the said ball. As is clearly in icated in the drawing, l

Communication between theaxial orifice of the tubular valve seat and the cavity in the ballcasing, when ball is aty rest, is. established by radialrecesses or passages 02 in the walls of the said tubular valve seat. f is the plunger slidably accommodated in the valve casing a, being preferably of frusto-conical form and normally seating-upon an annular ridge or seat a2 in the said casingv and being provided with; recesses fmin its` periphery, the said plunger having a spindle f2 extending axially therefrom into the tubular valve seat c in proximity with the ball e when the said part-s are at rest or in their inactive position. g is a slidable member also accommodated within the casing a beneath the said plungerl f and maybe in the form of a weight or float, as may be necessary or desirable, the said Vmember g having a fluid passage g therein normally more or less closed by the said plunger. The said member g in the example seats itself on the base of the said casing a which is restricted at this point for this purpose. L is anipple extending from the annular orifice a of the valve whereby it may be secured to such device with which it is desired to be used.

rlhe relative arrangement and construction of the parts described is intended to permit the passage of fluid, at a pressure lower than a certainv predetermined degree, through the orifice g by the slight raising of the plunger f and around the sealed ball e, whereby it may so escape through the outlet d. The clearance between the upper end of the spindle f2 permits any slight raising of the plunger which may be necessary to permit the passage of such fluid thereunder without disturbing the ball ,and the orifice g limits the effective pressure upon the said plunger, to prevent undue raising thereof until the pressure may increase to an extent causing the member g to be raised, when the spindle of the plunger will effect the closing of the ball valve e, closing the valve. lVhere the member -g is in the form of a float, a surge or undue quantity of a heavy fluid, and a water, would have the saine closing effect. A decrease of pressure, whilst permitting the parts y and g to descend, may still retain the ball valve in its closed position, as will be readily understood, so that the valve would remain closed until the pressure was reduced to a predetermined extent below that required to close the valve, owing to the nature of its seat, 'as described, whereby pressure is relieved from approximately the entire upper surface of the ball, except that exposed to the youtlet ci, which is subject to ordinary atmospheric pressure. It will be seen that thev passage around the ball is somewhat restricted, above the center of said ball, so that pressure of escaping fluid is greatest at this point and tends to retain the valve open until theplunger operates as hereinbefore described. Y

It will be seen that the working parts of the device may easily be of a readily interchangeable nature, so that parts, such as g, may be used in varying weights to suit the conditions under which the valve is intended Yto be usedgjand incases where the closing pressure is not to be so particularly determined, the member g may be omitted.

This invention may be developed within the scope of the following claims without departing from the essential features of the said invention and it is desired that the specification and drawings be read as being merely illustrative and not in a limiting sense, except as necessitated by the prior art.

vWhat I claim 4as my invention is:

1. A device of the class described, comprising a ball casing havingan outlet orifice therein, a ball within said casing, a rplunger casing communicating'` with said ball casing and having an inlet orifice therein, a plunger slidablyV accommodated within said plunger casing, said plunger being adapted, when raised, to move said ball to close said outlet orifice, and said ball being capable of retention in such closing position at a lower pressure than that required to raise said plunger, and a slidable member, operable beneath said plunger, having a restricted passage therein through which fluid is admitted to said plunger.

2. In a device of the class described, a ball casing, a plunger casing communicating therewith, said ball and plunger casings having'outlet and inlet orifices therein respectively, a ball within said ball casing, a tubular seat between said casings for said ball, said seat havingV passages therein whereby fluid may pass through the device when said ball isat rest', and a plunger having a stem slidable in saidtubular seat to move said ball to close said outlet orifice, said ball being capable of retention, in such closing position, at a lower pressure than that required to raise said plunger.

3. In a device'of the class described, a ball casing, a plunger casing communicating therewith, said ball and plu-nger casings having outlet and inlet orifices therein respectively, a ball within said ball casing, a

county of York, in the Province of Ontario,

in the Dominion of Canada, this 24th day of November, 1917.

JOHN GALLIoojrir.l

Goplea et 'thiapatent may be obtained for Lave 'cents each, by vafldressing 'thev Commissioner of Eatenta Washimgteza 

